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dc.contributor.authorSimmonds, Michaelen_US
dc.contributor.authorMinahan, Clareen_US
dc.contributor.authorSabapathy, Surendranen_US
dc.contributor.editorSusan A Warden_US
dc.date.accessioned2017-04-24T10:25:21Z
dc.date.available2017-04-24T10:25:21Z
dc.date.issued2010en_US
dc.date.modified2010-09-16T08:18:25Z
dc.identifier.issn14396319en_US
dc.identifier.doi10.1007/s00421-009-1351-8en_AU
dc.identifier.urihttp://hdl.handle.net/10072/34016
dc.description.abstractThe purpose of this study was to determine if improved supramaximal exercise performance in trained cyclists following caffeine ingestion was associated with enhanced O2 uptake ( _VO2 kinetics), increased anaerobic energy provision (accumulated O2-AO2-deficit), or a reduction in the accumulation of metabolites (for example, K?) associated with muscular fatigue. Six highly trained male cyclists ( _V O2peak 68 ᠸ mL kg-1 min-1) performed supramaximal (120% _V O2peak) exercise bouts to exhaustion on an electronically braked cycle ergometer, following double-blind and randomized ingestion of caffeine/ placebo (5 mg kg-1). Time to exhaustion (TE), _V O2 kinetics, AO2 deficit, blood lactate (La-), plasma potassium (K?), caffeine and paraxanthine concentrations were measured. Caffeine ingestion elicited significant increases in TE (14.8%, p/0.01) and AO2 deficit (6.5%, p/0.05). In contrast, no changes were observed in AO2 deficit at isotime, _V O2 kinetics, blood [La-] at exhaustion or peak [K?] following caffeine ingestion. However, [K?] was significantly reduced (13.4%, p/0.01) during warm-up cycling immediately prior to the onset of the supramaximal bout for the caffeine trials, compared with placebo. It appears that caffeine ingestion is beneficial to supramaximal cycling performance in highly trained men. The reduced plasma [K?] during submaximal warm-up cycling may prolong the time taken to reach critical [K?] at exhaustion, thus delaying fatigue. Considering caffeine ingestion did not change _V O2 kinetics or isotime AO2 deficit, increases in absolute AO2 deficit may be a consequence of prolonged TE, rather than causal.en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_AU
dc.languageEnglishen_US
dc.language.isoen_AU
dc.publisherSpringeren_US
dc.publisher.placeGermanyen_US
dc.relation.ispartofstudentpublicationNen_AU
dc.relation.ispartofpagefrom287en_US
dc.relation.ispartofpageto295en_US
dc.relation.ispartofissue2en_US
dc.relation.ispartofjournalEuropean Journal of Applied Physiologyen_US
dc.relation.ispartofvolume109en_US
dc.rights.retentionNen_AU
dc.subject.fieldofresearchExercise Physiologyen_US
dc.subject.fieldofresearchcode110602en_US
dc.titleCaffeine improves supramaximal cycling but not the rate of anaerobic energy releaseen_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.date.issued2010
gro.hasfulltextNo Full Text


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